Safety-valve mechanism



1. BUCHEK. SAFETYYALNE MECHANISM AND PRESSUC. GAGE.

APPLICATION FILED MAR..'26. 1917.

" Patented July'l, 1919.

2 SHEETS-SHEET l- I. BUCHEK.

SAFETY VAL VE'MECHANJSM AND PRESSURE GAGE.

"APPLICATION FILED MAR. 26. 1917- Patented July 1, 1919.

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I SAFETY-VALVE MECHANISM AND PRESSURE-GAGE.

Specification of Letters Patent.

Patented July 1, 1919.

"Application filed March 26, 1917. Serial No. 1579560 To all whomz't may] mmcer'a Be it known that i, JOSEPH BUoHnK, a subject of the Emperor of Austria, residing in Oak Park, county of Cook, and State of Illinois, have invented a certain new and useful. Improvement in Safety-Valve Mechanism lowing is a specification.

This invention relates generally to safety- 0 valves and more particularly to safety-wives fir pneuinatic'tires and the like, and has among its objects the production of a novel valve of such character which will .prolong the life of pneumatic tires and prevent what is commonly termed as blow-outs.

Two principal causes underlie the blowing up of pneumatic-tires: first, under-intiation,

and second, ovcr-inflation. I

'When. an automoblle s run with tires under-inflated the sides"of the tire are subjected to a greater bending motion, which has a tendency of reduallyweakening and breaking the fibers in the material and thereby producing a weakened tire which easily 25 bursts when the air pressure is increased therein.

Also, an over-inflated tire may burst when the air in the tire is sui'liciently heated to an excessive air prossure for a weakened portion in the tire.

The principal object of this inventionrcsides in the provision of a safety valve for 'pneuu'iatic tires. which will automatically,

exhaust and relieve the pressure in the tile when such pressure has been raised to or 0 22 of Fig. sure gage chamber with cover or upper pun above a pro-determined point 1 With the above and other objects iii-view,

the invention consists in the details otconstrurtion and in the arrangement and combination of parts hereinafter described and particularly pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings, wherein like reference characters denote corresponding parts in the several views, and in which: I v

Figure 1 is.an elevation of my improved mechanism. Fig. 2 is a section taken on line Fig. is a view of the prestion removed. Fig. 4 shows a fra montar h view of the pressure gage cover showing the pressure indicator. Figs. 5 and 6 show. re-

'spcctively, a plan view and cross section and Pressu re-(arages, of whl'fihthe fol- I taken on line 66, of the valve stem retainingmember. Fig.7 shows an enlarged detail showing a modification embodying an auxiliary exhaust valve and operating mechanism, and Fig.8 is a View taken on" line fio 8-8 of Fig. 7. Fig; 5) is an enlarged portion of the tubular valve member showing graduations indicatlng points of exhaust.

Referring to the draw1ngs,1ny' lnvention finds one embodiment in a structure comprising a valve body which is generally indicated by 10 and which body 10 includes the lower member 11 which comprises the interiorly threaded nut portion 11* and the annular pressure gage chamber 11. The interior threads 11" are arranged to engage the usual tire valve stem 12 and a suitable paclfi ing 13 is'provided for sealing purposes as will be obvious. The upper bore 1 1 1s large enough tojclear the narrowed top or cap portion 12* of the stem 12 which is providedwith the interior )assa e 12 communicating with the interior of the tire tube 14 i which tube is partly shown in Fig. 2.

The gage chamber 11 has screw connec- .tion with the cover portion 15 which is prov .Vided with the central opening 15 to permit the passage of air from the open valve stem 12 intothe expandible tubular member 16 which may be of rubber or any other suitable expansible material, The top of the cover '15 is cast with a raised ring 15? threaded interiorly and exteriorly, A"pair of lugs 15 also cast upon the upper surface of the cover 15, prevent any lateral motion wardly extended valve stem 18 in its vertical movement, and is'forme'd with the perand the holes 17 for the lugs 15.

20 which by virtue of its threadthe expandible 1 the disk 17 and washer 19; The upper inwardly extending flange 16 is thickened .and is-rigldly, held bet-ween a pair of ordinary; washers 21 which washers and the thickened portion 16: vare mounted on thello 9.0 of the disk 17 which disk limits the down I lower thieaded end of the vertically movable tubular valve member and are conlfinedlby' the nut 23 ,and the shoulder 22 he tubular valve member 22' is preferably, centrally mounted with relation to the eupaiidible member "16- and is provided withhn interior bore 24 having an upper enlarged portion 24? containingthe common form 1013' check valve 25 which includes the jects normally a little above-the orifice orvalve Eseat1 26 and the valve 27 mounted onthe upper portion 'of the stem 18. The valve is'norrnally closed by means ,of,sp1'-ing*28' which is confined between the'velve 27 and J the metal i-estor shoulder 29;

'Asis well understood, the stem- 18pm terminitl 122 which is threaded both in teriorly and exteriorly.

Anenlarged port'on abuts, against the-flangedcollar 30 which is loosely;nnmiutedon the member 22 andll:

which collar 30 is confined beneath the inner flange 31 oi the interiorly threaded tubular member 31 which is screw mounted on the threaded tube 20. Such member 31 it is 010- served-iorms' means for adjusting and regal:

lating the pressure of spring 32 thereby varying the point of. exhaust for the valve 27. Toprevent any crushing-of the expand .ible" member 16 'by th'e forceof the spring 32, the tube 20 is 'provided'with an'inner collar 20 which supports the enlarged portion 22 of 'thevalve'member 22 and limits the downward movement thereofi v The spring" 32 and t-he various roiiperating petrts'are so proportioned thatwheri the member 3i is screwed downwardlyto the proper maximum pressure desired w1th in the tire, which desired pressure w'ilhbd raise the'tubular valve member 22 and they valve27 and thereby unseat such valve 37' indicated by reading, of the graduations which aline with the top surface '31; of the memben 31,- any increase i irnressui'e' over such predetermined maxmmm pressure will from the seat '26 to permit an escape Jot air to release and lower the pressure whereupon the valve 27 will again resume its normal closed position. It will be observedg'that the unsating of valve 27 is due to 't h'e' fact that the valve stem 18 is limited in its up ward movement by; confinement"within the disk "17.,

In the modified construction of exhaust valve, shown in Figs. 7 audfh. the exhaust Of any increased air pressure is through the auxiliary valve generally,indicated b which comprises the tubular valviseaj'i -iitl,

'the valve 37 which has anau'nvardly ch;

tending stem 38 terminating with finger 39 which guide and maintain the relative central alinement of such valve 37, and seat 36 Extending downwardly tronithe v lve L 22 on the lower p01". tion oftthe}me'lnbea- 22 forms a 'seatfor a coiled spring 32; the upper end of which 37 which is held stationary and limited in its vertical movement by the abutment of the pin 44 with the bottom edge of the slot 41, such pin 44 extending transversely through the upper pertof rod 45 which is rigidly mounted to the washer 42 and'thc upper end of which extendswithin the tubular portion 4O 3 7 and integral therewith is a tubular pow. Y

The opening or exhausting of To, normally positively retain the valve 37 in closed position,.I provide the spring pressed lever 46 mounted on pins 50 .sup-

ported on the lower end of tubular mom-- ber- 22 and which at one end isactuated by the spring 47 which is retained between the J lugs 48 and 49. The other end is forked. and 'provided with slotted openings in the ends of such forks "through Which' extend the ypins iil within the top part of member 40.

The pressure gage or indicator which is common to both structures and which is located in the chamber 11 comprisesawell known vibrating pressure tilbe 52. having direct communication with interior of bore 11 through the cross tube 53 andfcarrymg the pin 54 at the movable end thereof, which pin 54 extends into the slot 55 of the pivoted lever 56, the other end of whichlev'er {)6 forms a segmental rack 57 which operates the 4 pinion 58. TheppiniOn 58 has rigid connection with the indicating dial upon" which are clrcumferentially arranged gmduation's indicating, by their regist'rati'on with the fixed arrow 60 on the-edge (i -"15, the pressure within the tire tube 14. l

The dial'hf) is visible through thv open- .ing 15 and transparent cover'fil secured underneath.

A cylinder cap 33 provided with theex; ,haust opening 34 and having a wide mouth which is interiorly threaded for screw-conncctio'n'with the portion 15 of cover 15, in-

closes the upper interior valve parts for protection. from dust, water and other. elements which might hinder the eiiicient operation.

I claim: 1 1 A valve mechanism comprising a valve body, a j'vertically movable tubular valve member within the body, an expandible member connected to thcyvalve member and to the body, a valve in said valve-member, a valve stem connected to the movable partof said valve. and a dlsk underlylng one endof the cxpandible member, said disk coilperating with .the valve stem to limit movement thereof in the outward direction.

2. A valve mechanism comprising a gage member and including a, stem, and means chamber to be secured to the valve stem of carried by the chamber tojimit movement 10 the tire, a, 'tube removably secured to the of-said stem in the outward direction. chamber, an expandible member secured at ",In witness whereof I have hereunto sub- 5 its lower'end to the chamber by said tube, scribed my name this 23rd day of. March,

a tubular valve member slidable in the .tube 1817.. h and connected to the up er and 0f the expandible member, a va e in said valve JOSEPH BUOHEK. 

